<template>
  <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title"
        @keyup.enter="add"
        >
  </div>
</template>

<script>

import {nanoid} from 'nanoid'
export default {
  name: "MyHeader",
  props:["addTodo"],
  data(){
    return {
      //收集用户输入的title
      title:''
    }
  },
  methods:{
    add(){
      //校验数据
      if(!this.title.trim()){
      return alert('输入不能为空')
      }
      //将用户的输入包装成一个对象
      const todoObj = {id:nanoid(),title:this.title,done:false}
      this.addTodo(todoObj)
      this.title = ''

      }

    }
  }
  
</script>

<style scoped>
	/*header*/
	.todo-header input {
		width: 560px;
		height: 28px;
		font-size: 14px;
		border: 1px solid #ccc;
		border-radius: 4px;
		padding: 4px 7px;
	}

	.todo-header input:focus {
		outline: none;
		border-color: rgba(82, 168, 236, 0.8);
		box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
	}
</style>